664667089 has 2 divisors, whose sum is σ = 664667090. Its totient is φ = 664667088.

The previous prime is 664667083. The next prime is 664667099. The reversal of 664667089 is 980766466.

664667089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574417089 + 90250000 = 23967^2 + 9500^2 .

It is a cyclic number.

It is not a de Polignac number, because 664667089 - 2⁵ = 664667057 is a prime.

It is not a weakly prime, because it can be changed into another prime (664667083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332333544 + 332333545.

It is an arithmetic number, because the mean of its divisors is an integer number (332333545).

Almost surely, 2^664667089 is an apocalyptic number.

It is an amenable number.

664667089 is a deficient number, since it is larger than the sum of its proper divisors (1).

664667089 is an equidigital number, since it uses as much as digits as its factorization.

664667089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 664667089 is about 25781.1382409699. The cubic root of 664667089 is about 872.7061940731.

The spelling of 664667089 in words is "six hundred sixty-four million, six hundred sixty-seven thousand, eighty-nine".